mips: add asm/stat.h to UAPI compile-test coverage

asm/stat.h is currently excluded from the UAPI compile-test for
ARCH=mips because of the errors like follows:

    HDRTEST usr/include/asm/stat.h
  In file included from <command-line>:32:
  ./usr/include/asm/stat.h:22:2: error: unknown type name 'ino_t'
     22 |  ino_t  st_ino;
        |  ^~~~~
  ./usr/include/asm/stat.h:23:2: error: unknown type name 'mode_t'
     23 |  mode_t  st_mode;
        |  ^~~~~~
  ./usr/include/asm/stat.h:25:2: error: unknown type name 'uid_t'
     25 |  uid_t  st_uid;
        |  ^~~~~
  ./usr/include/asm/stat.h:26:2: error: unknown type name 'gid_t'
     26 |  gid_t  st_gid;
        |  ^~~~~
  ./usr/include/asm/stat.h:58:2: error: unknown type name 'mode_t'
     58 |  mode_t  st_mode;
        |  ^~~~~~
  ./usr/include/asm/stat.h:61:2: error: unknown type name 'uid_t'
     61 |  uid_t  st_uid;
        |  ^~~~~
  ./usr/include/asm/stat.h:62:2: error: unknown type name 'gid_t'
     62 |  gid_t  st_gid;
        |  ^~~~~

The errors can be fixed by prefixing the types with __kernel_.

Then, remove the no-header-test entry from user/include/Makefile.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>

arch/mips/include/uapi/asm/stat.h

@@ -19,11 +19,11 @@
 struct stat {
 	unsigned	st_dev;
 	long		st_pad1[3];		/* Reserved for network id */
-	ino_t		st_ino;
-	mode_t		st_mode;
+	__kernel_ino_t	st_ino;
+	__kernel_mode_t	st_mode;
 	__u32		st_nlink;
-	uid_t		st_uid;
-	gid_t		st_gid;
+	__kernel_uid_t	st_uid;
+	__kernel_gid_t	st_gid;
 	unsigned	st_rdev;
 	long		st_pad2[2];
 	long		st_size;
@@ -55,11 +55,11 @@ struct stat64 {
 
 	unsigned long long	st_ino;
 
-	mode_t		st_mode;
+	__kernel_mode_t	st_mode;
 	__u32		st_nlink;
 
-	uid_t		st_uid;
-	gid_t		st_gid;
+	__kernel_uid_t	st_uid;
+	__kernel_gid_t	st_gid;
 
 	unsigned long	st_rdev;
 	unsigned long	st_pad1[3];	/* Reserved for st_rdev expansion  */
@@ -96,11 +96,11 @@ struct stat {
 
 	unsigned long		st_ino;
 
-	mode_t			st_mode;
+	__kernel_mode_t		st_mode;
 	__u32			st_nlink;
 
-	uid_t			st_uid;
-	gid_t			st_gid;
+	__kernel_uid_t		st_uid;
+	__kernel_gid_t		st_gid;
 
 	unsigned int		st_rdev;
 	unsigned int		st_pad1[3]; /* Reserved for st_rdev expansion */

usr/include/Makefile

@@ -65,10 +65,6 @@ no-header-test += asm/sigcontext.h
 no-header-test += linux/if_bonding.h
 endif
 
-ifeq ($(SRCARCH),mips)
-no-header-test += asm/stat.h
-endif
-
 ifeq ($(SRCARCH),powerpc)
 no-header-test += asm/stat.h
 no-header-test += linux/bpf_perf_event.h